If a project has a lot of templates within it, would be nice to be able to ad subfolders to sort the templates and organize everything nicely within the web portal viewer. For example, if there are multiple templates for a specific area of a facility would be nice to be able to put all those templates in a folder with a custom name to easily get to everything that pertains to that area.
This is already a feature of the product. You can configure Template Categories as detailed in this document:
Setting up a project
This will allow you to configure categories like "Area 1" and "Area 2" and then drag the templates for each area to their respective categories.